BUILD_gflags_nothreads_LIBS | Request build of single-threaded gflags libraries.
GFLAGS_NAMESPACE | Name of the C++ namespace to be used by the gflags library. Note that the public source header files are installed in a subdirectory named after this namespace. To maintain backwards compatibility with the Google Commandline Flags, set this variable to "google". The default is "gflags".
GFLAGS_INTTYPES_FORMAT | String identifying format of built-in integer types.
GFLAGS_INCLUDE_DIR | Name of include where headers are installed into relative to CMAKE_INSTALL_PREFIX.
GFLAGS_INCLUDE_DIR | Name of headers installation directory relative to CMAKE_INSTALL_PREFIX.
LIBRARY_INSTALL_DIR | Name of library installation directory relative to CMAKE_INSTALL_PREFIX.
INSTALL_HEADERS | Request installation of public header files.
